You can check which object privileges have been granted to a role by querying role_tab_privs.
SQL> desc role_tab_privs;
Name Null? Type
ROLE NOT NULL VARCHAR2(30) --User to whom the privilege was granted.
OWNER NOT NULL VARCHAR2(30) --User who owns the object.
TABLE_NAME NOT NULL VARCHAR2(30) --Name of the object on which privilege was granted.
COLUMN_NAME VARCHAR2(30) --Name of the column (if applicable).
PRIVILEGE NOT NULL VARCHAR2(40) --Privilege on the object.
GRANTABLE VARCHAR2(3) --Whether the privilege was granted with the GRANT option. Equal to YES or NO.
SELECT *
FROM role_tab_privs;